#include <stdio.h>  
#include <math.h>  
#include "MyNative.h"  
JNIEXPORT void JNICALL Java_MyNative_showParms0  

  (JNIEnv *env, jobject obj, jstring s, jint i, jboolean b)  
{  
  const char* szStr = (*env)->GetStringUTFChars( env, s, 0 );  
  printf( "String = [%s]\n", szStr );  
  printf( "int = %d\n", i );  
  printf( "boolean = %s\n", (b==JNI_TRUE ? "true" : "false") );  
  (*env)->ReleaseStringUTFChars( env, s, szStr );  
} 
 
JNIEXPORT jint JNICALL Java_MyNative_hypotenuse0  
  (JNIEnv *env, jobject obj, jint a, jint b)  
{  
  int rtn = (int)sqrt( (double)( (a*a) + (b*b) ) );  
  return (jint)rtn;  
}
  
JNIEXPORT void JNICALL Java_MyNative_setArray0  
  (JNIEnv *env, jclass cls, jbooleanArray ba)  
{  
  jboolean* pba = (*env)->GetBooleanArrayElements( env, ba, 0 );  
  jsize len = (*env)->GetArrayLength(env, ba);  
  int i=0;  
  // change array elemente
  for( i=0; i < len; i+=2 )  
    pba[i] = JNI_FALSE;  
  (*env)->ReleaseBooleanArrayElements( env, ba, pba, 0 );  
}
  
JNIEXPORT void JNICALL Java_MyNative_showStrings0  
  (JNIEnv *env, jclass cls, jobjectArray sa)  
{  
  int len = (*env)->GetArrayLength( env, sa );  
  int i=0;  
  for( i=0; i < len; i++ )  
  {  
    jobject obj = (*env)->GetObjectArrayElement(env, sa, i);  
    jstring str = (jstring)obj;  
    const char* szStr = (*env)->GetStringUTFChars( env, str, 0 );  
    printf( "%s ", szStr );  
    (*env)->ReleaseStringUTFChars( env, str, szStr );  
  }  
  printf( "\n" );  
}
  
JNIEXPORT jobjectArray JNICALL Java_MyNative_getStrings0  
  (JNIEnv *env, jclass cls)  
{  
  jstring      str;  
  jobjectArray args = 0;  
  jsize        len = 5;  
  char*        sa[] = { "Hello,", "world!", "JNI", "is", "fun" };  
  int          i=0;  
  args = (*env)->NewObjectArray(env, len, (*env)->FindClass(env, "java/lang/String"), 0);  
  for( i=0; i < len; i++ )  
  {  
    str = (*env)->NewStringUTF( env, sa[i] );  
    (*env)->SetObjectArrayElement(env, args, i, str);  
  }  
  return args;  
} 
